definition

03
Jun
ALLIGATION OR MIXTURE

Alligations  is the rule that helps us to find the amount in which two different quantities of  a substance are mixed so as to arrive at average cost.

☼ If  the gradients are mixed in some ratio,   then

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03
Jun
Examples(2)

(8) If  a, b, c, d  are four consecutive odd integers, then give its average in the form of  a.

Soln.    A          b          c

Here, a, b, c, d are in A.P.

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03
Jun
Examples

Examples  :

(1) Find the average of  first  7 prime numbers.

Soln. Required average  = 

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03
Jun
Harmonic  Mean 

Harmonic  Mean  :   If the reciprocals of  the terms is an arithmetic series is taken and then summed up, then the number of  observations divided by the sum is defined as Harmonic mean.

Harmonic  mean   of 

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03
Jun
Geometric  Mean 

Geometric  Mean  :   The geometric mean (G.M.) of  n  numbers is the nth root of  the product of  the  n  numbers.

Therefore, Geometric mean of  a_{...
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